Line printed at each key pressed in new Python REPL GUI

[Church-17]

Bug report

Bug description:

Using Python 3.13, in the new Python REPL GUI, if I write more characters than the length of the line in my terminal without pressing Enter (so the text go in the next line but without do a multiline input) and then i move the cursor to the start of the line (or position it in the superior line) and start to digit again, the same input line is been printed lot of times

CPython versions tested on:

3.13

Operating systems tested on:

Windows

[terryjreedy]

I verified on Windows 10 both with py -3.13 in Command Prompt and in 3.14 Python Window. Cursor movement is with Home, Left and Right Arrow, and End keys. In the following, I typed thk...jkj with letters only, used Home and Right Arrow to move cursor after dsk, typed 4 three times, used End to add '), and hit Enter. The result is as follows. Note that I inserted \ns to make the result in this wider box look the same as in my Python window.

>>> print('thk dsk4jslkjf sfj ksfjklsjf sjf skjsfklj skjsfkjsf fsjfksfjskjsfjkj\
>>> print('thk dsk44jslkjf sfj ksfjklsjf sjf skjsfklj skjsfkjsf fsjfksfjskjsfjk\
>>> print('thk dsk444jslkjf sfj ksfjklsjf sjf skjsfklj skjsfkjsf fsjfksfjskjsfj\
kjsf fjj                                                   kjjfjkdkafjk kjsjsf j
kjsf fjj')
thk dsk444jslkjf sfj ksfjklsjf sjf skjsfklj skjsfkjsf fsjfksfjskjsfjkjjfjkdkafjk
 kjsjsf jkjsf fjj
>>>

Up/Down Arrow retrieval of history also seems messed up, but may only be side effect of this bug. Mouse clicks select rather than move cursor (as in IDLE and perhaps elsewhere).

EDIT: I did not check if there is an existing issue.

[lysnikolaou]

cc @pablogsal @ambv @DinoV

[Church-17]

Sorry for my lack of explanations. Here's some more debugging information and the instruction to reproduce this bug with screenshots.

Python version: Python 3.13.0 (tags/v3.13.0:60403a5, Oct 7 2024, 09:38:07) [MSC v.1941 64 bit (AMD64)] on win32
SO: Windows 11 Pro 23H2 build 22631.4317
Python interpreter is used through Windows Terminal 1.21.2701.0

Here's what I have done to get this bug: first I have write lot of characters (in the image represented by all the letters a), until they reach the end of the line and automatically goes on the next line, without using the Enter key. Immediatly after, I reposition the cursor at the start of the line with the home key (you can see the cursor in the image):

Here, I just pressed another character (to differentiate it from the previous characters, I used the letter q), and nothing else:

As you can see, the letter q is been writed in the correct position, but the cursor is been transported in a simil-random place, and there is a letter a flying into the terminal at the end of the second line.

Here, I just pressed another q and nothing else:

Now we can immediately see the >>> of the requested input printed out 2 times. In fact, seems that a large portion of the line is been reprinted from the new cursor position.

Here, I just pressed another q and nothing else:

Also at this moment the line is been reprinted, and this phenomenon continues for each character pressed from now on.

[pablogsal]

I cannot reproduce this in Linux or Mac so looks like a Windows-only issue.

[StanFromIreland]

Same here, unable to repro on Linux, can it please be labeled os-windows.